Plate-holder for printing-presses.



N0. 724,116. 'PATENTED MAR. 31, 19,03.

' H. A. MALBY.

I PLATE-HOLDER. FOR PRINTING PRESSES.

APPLIOATION Pump NOV. 20, 1902.

B0 MODEL.

UNITED STATES PATENT ()FFICEF HENRY A. MALEY, OF BOSTON, MASSACHUSETTS PLATE-HOLDER Ii OR PRlNTlNG-PRESSES.

srnorrrca'rron forming part of Letters Patent No. 724,116, dated March 31,1903.

Application filed November 20, 1902. Serial No. 132,051. (No model.) 7 d T0 at whom it may concern.-

Be it known that I, HENRY A. MALEY, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Plate-Holders for Printing-Presses, of which the following is a specification.

This invent-ion relates to holders for electrotype or other printing plates while the same are in use in a printing-press; and it has for its object to provide a simple and efficient means for holding plates of any size within the capacity of the press and in any position that may be desired.

Theinvention consists in the improvements which I will now proceed to describe and" claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a plan View of a part of the block portion of my improved holder with a plurality of clamping members engaged therewith, the whole constituting an embodiment of my invention. Fig. 2 represents a section on line 2 2 of Fig. 1. Fig. 3 represents a plan view of one of the eccentric clamping members. Fig. 4 represents a section on line 4 4 of Fig. 3. Fig. 5 represents a plan View of one of the slotted shoes. Fig. 6 represents a section on line 6 6 of Fig. 5. V

The same reference characters indicate the same parts in all the figures.

In the drawings, arepresents a block adapted to support one or more electrotype or other printing plates 19. The block ais preferably made of cast-iron and is formed to rest upon the bed of the press. In the block a are formed a large number of screw threaded orifices c, the same being arranged in diagonallyextending rows, as shown in Fig. 1, the holes of each row being arranged close together.

dd represent clamping-disks, each of which is provided with an eccentrically-arranged orifice (1, adapted to receive a screw e, the screw being formed to engage the thread of either of the orifices c. The flat under side of each clamping-disk bears upon a fiat seat formed by the upper side of a shoe f, which bears on the block a. Said shoe has a flange f at its inner edge, one side of the flange forming a straight shoulder. The inner edge of the shoe is thickened by said flange and is beveled to bear against the beveled edge of the printing-plate b. The shoe also has a slot f to receive the shank of the screw 6, said slot extending at right angles to the shoulder. It will be seen that a slight rotation of the disk don the screwe moves the perimeterof the disk toward or from the margin of the printing-plate. -When the screw is loosened, such movement of the clamp is readily permitted, and when the screw is tightened the disk clamps the shoe against the block and firmly holds it in any position to which it may, have been adjusted.

It will be seen from the foregoing that when a printing-plate his to be attached to the block a the mode of procedure is as follows: The plate is first located, and then a suitable number of the clamping devices above described are applied to the block a in positions required to engage them with the beveled margins of the printing-plate. The disposition of the threaded orifices c in diagonal rows, the holes of each row being close together, together with the adj ustability afforded by the clamping-disks d, rotatable upon the screws e, enables all the edges of the plate to be securely held whatever may be the location of the plate upon the block a.

The location of the eccentric clamping-disks above the shoes, so that the perimeter of said disks are exposed, enables the disks to'be conveniently manipulated by the fingers in adjusting the shoes to the Pfintingplate. This accessibility of the clamping-disks is a matter of much importance, because it greatly facilitates the operation of securing a plate or a series of plates toa block and enables said operation to be much more quickly performed .than would be possible if the shoe were recessed or provided withran ,enlarged orifice adapted to receive the disk and cover the edge thereof.

I claim v A plate-holding block having screw-thread ed orifices arranged in rows, plate-locking shoes formed to bear on said block, said shoes having flat upper surfacesor seats, shoulders seats and bear on the shoulders, said disks and slots extending substantially at right air gles with the shoulders, screws formed to pass through said slots and to engage the orifices in the block, and flat clam ping-disks the under sides of which bear on said seats, while their peripheries are accessible above the i In testimony whereof I have affixed my signature in presence of two witnesses.

HENRY A. MALEY.

1 extending across the inner ends of the seats, i having eccentric orifices receiving the screws. 0

Witnesses:

C. F. BROWN, E. BACHELDER. 

